|The following information is from the Adventure Time comic book series. It may not be part of the same canon or continuity as the animated series.|
Hot Dog Princess' bun is a character who appears in Happy Birthday Hot Dog Princess!, a backup story for Issue 8 of the Adventure Time comic book. When he was alive, he was the prince of Hot Dog Princess. In the comic, Hot Dog Princess and Peppermint Butler journey to the Land of the Dead to retrieve him from Death, but he is apathetic towards their rescue attempt and chooses to remain dead, claiming that he has everything he could ever want: soda, tetherball, and a vaste wasteland. This causes Hot Dog Princess to remark "Now I remember why I buried you!"
HDP's bun is a large ordinary hot dog bun. He wears a green baseball cap with a golden stag embroidered on the front. He has small stubby arms which he uses to play tetherball and drink soda.